prov:value
| - ough to the heat of radiation from furnace during treatment, and further 4) that the material can be molded as the closed introducing section of the inventive appliance, and, for example, quartz, hard glass, platinum, ceramics such as alumina, zirconia and titania, noncorrosive materials such as fluororesin like polytetrafluoroethylene, and the like can be used.
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